J/A+A/440/1061 Southern red high proper motion objects (Lodieu+, 2005)
Spectroscopic classification of red high proper motion objects in the
Southern Sky.
Lodieu N., Scholz R.-D., McCaughrean M.J., Ibata R., Irwin M., Zinnecker H.
<Astron. Astrophys., 440, 1061-1078 (2005)>
=2005A&A...440.1061L 2005A&A...440.1061L
ADC_Keywords: Stars, late-type; Proper motions ; Photometry, photographic ;
Photometry, infrared ; Radial velocities ; Space velocities
Keywords: surveys - stars: kinematics - stars: late-type -
stars: low-mass, brown dwarfs - techniques: photometric -
techniques: spectroscopic
Abstract:
We present the results of spectroscopic follow-up observations for a
sample of 71 red objects with high proper motions in the range
0.08-1.14 arcsec/yr as detected using APM and SuperCOSMOS Sky Surveys
(SSS) measurements of multi-epoch photographic Schmidt plates. Red
objects were selected by combining the photographic BjRI magnitudes
with 2MASS near-infrared JHKs magnitudes. Some 50 of the 71
spectroscopically classified objects turn out to be late-type (>M6)
dwarfs and in more detail, the sample includes 35 ultracool dwarfs
with spectral types between M8 and L2, some previously reported, as
well as five M-type subdwarfs, including a cool esdM6 object, SSSPM
J0500-5406. Distance estimates based on the spectral types and 2MASS J
magnitudes place almost all of the late-type (>M6) dwarfs within 50pc,
with 25 objects located inside the 25pc limit of the catalogue of
nearby stars. Most of the early-type M dwarfs are located at larger
distances of 100-200pc, suggesting halo kinematics for some of them.
All objects with Halpha equivalent widths larger than 10 Angstroms
have relatively small tangential velocities (<50km/s). Finally, some
late-type but blue objects are candidate binaries.
Description:
Table main gives the names, coordinates (J2000), epoch, proper
motions, and optical (BjRI) and near-infrared (JHKs) magnitudes for
new, red proper motion objects published in this paper.
Table obslog1 provides the observing logs for a subset of proper
motion objects observed photometrically with FORS1 and ISAAC on the
VLT. It includes observing dates, filters, and exposure times for each
object.
Table obslog2 gives the observing logs for a subset of proper motion
objects followed-up spectroscopically in the optical with FORS1 and in
the near-infrared with ISAAC. Observing dates and exposure times are
listed for each object.
Table obslog3 presents the observing logs for a subset of proper
motion objects followed-up spectroscopically in the optical with ESO
3.6-m/EFOSC2 and in the near-infrared with NTT/SofI. Names, observing
dates, and exposure times are listed for both wavelength ranges.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
main.dat 109 79 List of new, red proper motion objects (table1)
obslog1.dat 88 32 Obs. logs: photometry with FORS1 & ISAAC (table2)
obslog2.dat 73 22 Obs. logs: spectroscopy with FORS1 & ISAAC (table3)
obslog3.dat 58 49 Obs. logs: photometry with EFOSC2 & SofI (table4)
table5.dat 91 60 Results from optical spectra
table6.dat 82 27 Results from near-infrared spectra
table7.dat 97 15 Results the five new subdwarfs discovered
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See also:
J/A+A/421/763 : Liverpool-Edinburgh High-PM Catalogue (Pokorny+, 2004)
Byte-by-byte Description of file: main.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- RN Running number
4- 19 A16 --- Name Name of the target
21- 23 A3 --- Note Note about the presence in other catalogues (1)
25- 26 I2 h RAh Right ascension (J2000.0)
28- 29 I2 min RAm Right ascension (J2000.0)
31- 35 F5.2 s RAs Right ascension (J2000.0)
37 A1 --- DE- Declination sign (J2000.0)
38- 39 I2 deg DEd Declination (J2000.0)
41- 42 I2 arcmin DEm Declination (J2000.0)
44- 47 F4.1 arcsec DEs Declination (J2000.0)
49- 55 F7.2 yr Epoch Epoch of observation
57- 61 I5 mas/yr pmRA Proper motion in right ascension (incl. sign)
63- 67 I5 mas/yr pmDE Proper motion in right ascension (incl. sign)
69- 70 I2 mas/yr e_pmRA Error on the proper motion in right ascension
72- 73 I2 mas/yr e_pmDE Error on the proper motion in declination
75- 79 F5.2 mag Bjmag BJ magnitude from SSS
81- 85 F5.2 mag Rmag R magnitude from SSS
87- 91 F5.2 mag Imag I magnitude from SSS
93- 97 F5.2 mag Jmag J magnitude from 2MASS
99-103 F5.2 mag Hmag ? H magnitude from 2MASS
105-109 F5.2 mag Ksmag ? Ks magnitude from 2MASS
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Note (1): Notes "a" and "b" indicate that the object is also mentioned
in the proper motion catalogue of Pokorny et al. (see J/A+A/421/763)
and in the B1.0 catalogue (Monet et al., Cat. I/284), respectively.
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Byte-by-byte Description of file: obslog1.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- RN Running number
4- 19 A16 --- Name Name of the target
21- 30 A10 "YYYY/MM/DD" ObsO Date of the observation in RI bands
32 I1 --- NExpR Number of exposure in R band
33 A1 --- --- [x]
34- 35 I2 s ExpR Exposure time in R band
38- 42 F5.2 mag Rmag R magnitude from VLT/FORS1
44 I1 --- NExpI Number of exposure in I band
45 A1 --- --- [x]
46- 47 I2 s ExpI Exposure time in I band
50- 54 F5.2 mag Imag I magnitude from VLT/FORS1
56- 65 A10 "YYYY/MM/DD" ObsJHK Date of the observation in JsHKs band
67 I1 --- NExpJHK Number of exposure in JsHKs bands
68 A1 --- --- [x]
69 I1 s ExpJHK Exposure time in JsHKs bands
72- 76 F5.2 mag Jsmag ? Js magnitude from VLT/ISAAC
78- 82 F5.2 mag Hmag ? H magnitude from VLT/ISAAC
84- 88 F5.2 mag Ksmag ? Ks magnitude from VLT/ISAAC
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Byte-by-byte Description of file: obslog2.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- RN Running number
4- 19 A16 --- Name Name of the target
21- 30 A10 "YYYY/MM/DD" ObsO Date of the observation in Optical
32 I1 --- NExpO Number of exposure in Optical
33 A1 --- --- [x]
34- 36 I3 s ExpO Exposure time in Optical
39- 48 A10 "YYYY/MM/DD" ObsJHK Date of the observations in I band
50- 51 I2 --- NExpJ ? Number of exposure in J band
52 A1 --- --- [x]
53- 55 I3 --- ExpJ ? Exposure time in J band
58- 59 I2 --- NExpH ? Number of exposure in H band
60 A1 --- --- [x]
61- 63 I3 --- ExpH ? Exposure time in H band
66- 67 I2 --- NExpK ? Number of exposure in K band
68 A1 --- --- [x]
69- 71 I3 --- ExpK ? Exposure time in K band
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Byte-by-byte Description of file: obslog3.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- RN Running number
4- 19 A16 --- Name Name of the target
21- 30 A10 "YYYY/MM/DD" ObsO Date of the observation in Optical band
32 I1 --- NExpO ? Number of exposure in Optical band
33 A1 --- --- [x]
34- 37 I4 s ExpO ? Exposure time in optical band
40- 49 A10 "YYYY/MM/DD" ObsNIR Date of the observation in NIR band
51 I1 --- NExpNIR ? Number of exposure in NIR band
52 A1 --- --- [x]
53- 55 I3 --- ExpNIR ? Exposure time in NIR band
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Byte-by-byte Description of file: table5.dat
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Bytes Format Units Label Explanations
-----------------------------------------------------------------------------
1- 2 I2 --- RN Running number
4- 19 A16 --- Name Name of the target
21- 25 F5.3 --- indHa Halpha index (1)
27- 30 F4.1 0.1nm EWHa ? Halpha equivalent width
31 A1 --- n_EWHa [*] * for flare
33- 37 F5.3 --- TiO5dM ? Value of the TiO5 spectral index
39- 42 A4 --- SpTiO5 Spectral type associated to the TiO5 index
45- 49 F5.3 --- VOadM Value of the VO-a spectral index
51- 55 A5 --- SpVOa Spectral type associated to the VO-a index
57- 61 F5.3 --- PC3dM Value of the PC3 spectral index
63- 66 A4 --- SpPC3 Spectral type associated to the PC3 index
68- 71 A4 --- SpComp Spectral type from the comparison with a
template
73- 76 A4 --- SpType Final adopted spectral type
78- 82 F5.1 pc distdM Estimated distance
84- 87 F4.1 pc e_distdM Error on the distance
89- 91 I3 km/s vtdM Tangential velocity
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Note (1): Halpha index which measures the strength of the H emission line
compared to the neighbouring continuum.
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Byte-by-byte Description of file: table6.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- RN Running number
4- 19 A16 --- Name Name of the target
21- 24 F4.2 --- H2OA Value for the H2OA spectral index
26- 29 A4 --- SpH2OA Spectral type associated to the H2OA index
31- 34 F4.2 --- H2OB Value for the H2OB spectral index
36- 39 A4 --- SpH2OB Spectral type associated to the H2OB index
41- 45 F5.2 --- K1 ? Value for the K1 spectral index
47- 50 A4 --- SpK1 Spectral type associated to the K1 index
52- 55 F4.2 --- Q Value for the Q_Hband spectral index
57- 60 A4 --- SpQ Spectral type associated to the Q_Hband index
62- 65 A4 --- SpMean Mean near-infrared spectral type
67- 70 A4 --- SpType Final adopted spectral type (1)
72- 75 F4.1 pc distIR ? Estimated distance from the NIR spectral
types
77- 79 F3.1 pc e_distIR ? Error on the distance
81- 82 I2 km/s vtIR ? Tangential velocity
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Note (1): Final adopted spectral types are derived from the optical spectrum
when available otherwise they are derived from the direct comparison
with a near-infrared template.
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Byte-by-byte Description of file: table7.dat
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Bytes Format Units Label Explanations
-----------------------------------------------------------------------------
1- 2 I2 --- RN Running number
4- 19 A16 --- Name Name of the target
21- 25 F5.3 --- TiO5sd Value of the TiO5 spectral index
27- 31 F5.3 --- CaH1sd ? Value of the CaH1 spectral index
33- 37 F5.3 --- CaH2sd Value of the CaH2 spectral index
39- 43 F5.3 --- CaH3sd Value of the CaH3 spectral index
45- 51 A7 --- SpType Spectral type for subdwarfs and extreme
subdwarfs
53 A1 --- r_distsd [123] Source for distance estimate (1)
55- 57 I3 pc distsd Distance estimates
59- 60 I2 pc e_distsd Error on the distance estimates
62- 64 I3 km/s vt Tangential velocity
66- 69 I4 km/s RV ? Radial velocity
71- 72 I2 km/s e_RV ? Error on the radial velocity
74- 77 I4 km/s UVel Space motion : U component
79- 80 I2 km/s e_UVel Error on the U space motion
82- 85 I4 km/s VVel Space motion : V component
87- 89 I3 km/s e_VVel Error on the V space motion
91- 94 I4 km/s WVel Space motion : W component
96- 97 I2 km/s e_WVel Error on the W space motion
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Note (1): Three different distances, tangential velocities, and space
motions are listed for each subdwarfs, numbered as follows:
1 = a model-dependent distance estimate according to
Baraffe et al. (1997A&A...327.1054B 1997A&A...327.1054B)
2 = a distance estimate using comparison objects from
Gizis (1997AJ....113..806G 1997AJ....113..806G)
3 = a distance estimate based on empirical relationship between
spectral types and absolute Ks magnitudes from
Lepine et al. (2003AJ....125.1598L 2003AJ....125.1598L)
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Acknowledgements: Nicolas Lodieu
(End) Nicolas Lodieu [University of Leicester, UK] 16-Nov-2005